|Publication number||US6968858 B2|
|Application number||US 10/449,095|
|Publication date||Nov 29, 2005|
|Filing date||Jun 2, 2003|
|Priority date||Jun 1, 2002|
|Also published as||DE10224430A1, US20040007271|
|Publication number||10449095, 449095, US 6968858 B2, US 6968858B2, US-B2-6968858, US6968858 B2, US6968858B2|
|Inventors||Michael Kuehn, Ulrich Mueller|
|Original Assignee||Robert Bosch Gmbh|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (9), Referenced by (10), Classifications (18), Legal Events (4)|
|External Links: USPTO, USPTO Assignment, Espacenet|
1. Field of the Invention
The invention is directed to check valve in which noise generation is reduced.
2. Description of the Prior Art
A check valve is known from DE 195 07 321 C2, in which vibrations and pressure pulsations are suppressed by virtue of the closing body being damped when it reaches its open end position. Before reaching this end position, however, the closing body can vibrate freely so that noise and pressure pulsations can occur.
The check valve according to the invention has the advantage over the prior art that the generation of noise is sharply reduced. The asymmetrical circulation around the closing body causes the force resulting from the flow and acting on the closing body to have a transverse component in relation to the opening direction, as a result of which, increased friction and damping are generated in the closing body guide. These friction forces are proportional to the flow and therefore only occur when there is flow through the check valve, thus assuring a reliable insertion of the closing body into the valve seat when the delivery stops. The friction forces acting in the closing body guide result in a reduction of vibrations and pressure pulsations over the entire travel path of the closing body and not only when it is resting in the end position.
Advantageous modifications and improvements of the check valve are also possible. For example, asymmetrical circulation around the closing body can preferably be achieved by virtue of the closing body being asymmetrically designed or the housing wall that encompasses the closing body being asymmetrical, for example by virtue of a channel that extends in the opening direction over at least part of the travel path of the closing body being provided in the housing wall that encompasses the closing body, or by virtue of both the closing body and the housing wall that encompasses it being asymmetrical.
It is also advantageous to provide the closing body as being comprised of a closing section with an adjoining cylindrical section and to achieve the asymmetry by providing a flattening in the cylindrical section.
It is advantageous to design the closing section in the form of a sphere, a sphere segment, or a truncated cone since all of these embodiments are automatically centered as they are inserted into the valve seat and therefore produce a reliable seal. Embodying the closing body as a sphere is also advantageous because spheres can be inexpensively produced as mass produced products with a high degree of precision and in large production runs.
Making the closing section out of rubber or plastic has the advantage of a favorable damping of the closing body when it is inserted into the valve seat.
The invention will be better understood and further objects and advantages thereof will become more apparent from the ensuing detailed description of preferred embodiments taken in conjunction with the drawings, in which:
The check valve includes a housing 1 having an inlet opening 2 and an outlet opening 3, which communicate with an inner chamber 4. The inlet opening 2 leads to an inlet conduit 5, which at its other end, transitions into a for example conical valve seat 6. The valve seat 6 is disposed in a first end wall 23 of the inner chamber 4, which contains a movable closing body 7 and has an outlet conduit 15 with the outlet opening 3. The cross section of the inner chamber 4 is cylindrical. The inner chamber 4 is radially defined by a housing wall 16. When the check valve is closed, the closing body 7 rests against the for example conical valve seat 6. A stop 8 limits the movement of the closing body in the opening direction 19. The closing body 7 is comprised of a closing section 9, which is oriented toward the valve seat 6 and designed for example in the form of a hemisphere or truncated cone, and an adjoining cylindrical section 10 that is provided with a flattening 11. The closing section 9 here is comprised of rubber or plastic, for example. The diameter of the cylindrical section 10 can be greater than, equal to or smaller than the diameter of the closing section. The cylindrical section 10 is adjoined by a guide pin 12, which is guided in a guide bore 13 of the housing 1. A compression spring 14 rests against the cylindrical section 10 of the closing body 7 and against the end wall 20 of the housing 1 and presses the closing body 7 toward the valve seat 6.
If the fuel pressure upstream of the valve seat 6 exceeds a predetermined value, then the closing body 7 lifts away from the valve seat 6. The check valve opens and fuel flows through the inlet conduit 5, the inner chamber 4, and the outlet conduit 15.
The flattening 11 generates an asymmetrical circulation around the closing body 7. The flattening 11 is best seen in the cross section view of
If the fuel pressure falls below the predetermined value, e.g. when the fuel pump is switched off, then the check valve closes again and the delivery of fuel to the internal combustion engine stops.
In the check valve according to
In the check valve according to
By contrast with the exemplary embodiments according to
The foregoing relates to preferred exemplary embodiments of the invention, it being understood that other variants and embodiments thereof are possible within the spirit and scope of the invention, the latter being defined by the appended claims.
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|U.S. Classification||137/539.5, 137/542, 137/539, 137/540, 251/284|
|International Classification||F02M37/00, F16K15/04, F16K15/06|
|Cooperative Classification||Y10T137/7932, F02M37/0041, Y10T137/7927, F16K15/063, Y10T137/7937, Y10T137/7929, F02M37/0023, Y10T137/7928|
|European Classification||F02M37/00D6, F16K15/06C|
|Sep 26, 2003||AS||Assignment|
Owner name: ROBERT BOSCH GMBH, GERMANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KUEHN, MICHAEL;MUELLER, ULRICH;REEL/FRAME:014533/0828;SIGNING DATES FROM 20030602 TO 20030616
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